frame_height=186;
frame_width=110;
frame_thickness=2;

difference() {
    // frame
    cube([frame_height,frame_width,frame_thickness]);
    
    // case cutout
    case_height=159;
    case_width=90.5;
    case_thickness=2;
    translate([(frame_height-case_height)/2,(frame_width-case_width)/2,-0.5]) {
        cube([case_height,case_width,frame_thickness+1]);
    }
}

// walls
cube([frame_height,1,frame_thickness+2]);
translate([0,frame_width-1,0]) {
    cube([frame_height,1,frame_thickness+2]);
}
cube([1,frame_width,frame_thickness+2]);
translate([frame_height-1,0,0]) {
    cube([1,frame_width,frame_thickness+2]);
}

$fn=70;